Quote:I was thinking the issue was most likely to be with the Will's World client since (based on submitted high scores) the levels are working okay in Tile World...
I'm not an expert on the nuances of Will's World, but I do know that there are some situations that play differently between Will's World and Chip's Challenge. As an example, see this custom level which is unsolvable in all versions of Chip's Challenge but is solvable in Will's World. (Or was at the time of that level being made, at least.)
The highscore site only tracks MS scores (original CHIPS.exe or Tile World MS mode) and Lynx scores (Tile World Lynx mode). In fact, all the CCLPs so far have only been designed with MS and Lynx in mind and not any other implementations of the game like Will's World. It's worth keeping in mind that some CCLPx levels may be unsolvable in Will's World not only because of glitches in Will's World, but also potentially because of slightly different implementations of the rules of the game.